Good Riddles

Question: I am almost nonexistent through sorrow, yet am frequent through happiness. I have no contact, yet I am contagious. What am I?

Question: if last year "shoe" was written with a "s" how do we wright it today

Question: I can easily impale meat, And also can withstand the heat of a charcoal burning fire.

Question: The remote is hidden in a valley with two t's at the end a u in the middle a b at the start, Where's the remote?

Question: What goes through towns and over hills, but never moves?